Hormonal
Dietary palmitic acid intake does not significantly increase tissue palmitic acid levels because endogenous de novo lipogenesis (DNL) compensates by reducing synthesis, maintaining homeostasis under normal conditions.
If you are metabolically healthy, eating palmitic acid (found in palm oil, meat, dairy) does not automatically raise your body's palmitic acid levels. Your body compensates by making less internally. However, this balance breaks down if you have obesity, insulin resistance, or eat too many sugars, which force your body to overproduce fat.
PA tissue content seems to be controlled around a well-defined concentration, and changes in its intake do not influence significantly its tissue concentration because the exogenous source is counterbalanced by PA endogenous biosynthesis.
Why this rating
The paper is a comprehensive review citing multiple studies (Innis and Dyer, 1997; Song et al., 2017) and explains the biological mechanism (DNL compensation) clearly.
Source
Palmitic Acid: Physiological Role, Metabolism and Nutritional Implications
Gianfranca Carta et al. · Frontiers in Physiology · 2017
DOI 10.3389/fphys.2017.00902
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- Palmitic acid is essential for physiological functions including maintaining membrane fluidity, protein palmitoylation, and lung surfactant activity (DPPC), and its deficiency can impair lung function.Strong
- Excessive intake of carbohydrates (especially mono and disaccharides) combined with positive energy balance disrupts palmitic acid homeostasis, leading to increased tissue PA, dyslipidemia, and inflammation via Toll-like receptor 4.Good
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